ASTM A193 B8 Stud Bolt and A194 8 Hex Nuts,SS304 Stud bolt
Austenitic Stainless Steel Stud Bolts for Corrosive & High-Temperature Service
ASTM A193 Grade B8 stud bolts are manufactured from austenitic stainless steel (Type 304) and are designed for high-temperature, high-pressure, and corrosive environments. Produced in accordance with ASTM A193, Grade B8 fasteners provide excellent corrosion resistance, oxidation resistance, and good mechanical strength, making them widely used in chemical processing, food & beverage, pharmaceutical, and marine applications.
B8 stud bolts are commonly selected where corrosion resistance is more critical than extremely high strength.
What Is ASTM A193?
ASTM A193 is the standard specification for alloy steel and stainless steel bolting materials intended for high-temperature or high-pressure service,
ASTM A193 fasteners are widely used in ASME pressure systems.
Download ASTM A193 standard pdf
Material Grade: ASTM A193 Grade B8
ASTM A193 Grade B8 is an austenitic stainless steel bolting grade, equivalent to AISI 304 stainless steel.
Grade B8
There are 2 general grade under ASTM A193 B8
ASTM A193 Grade B8 Class 1 Stud bolt, ASTM A193 Grade B8 Class 2 Stud bolt,
| ASTM A193 B8 CL1 | Class 1 Stainless steel, AISI 304, carbide solution treated. |
| ASTM A193 B8 CL2 | Class 2 Stainless steel, AISI 304, carbide solution treated, strain hardened |
Product Form
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Product: Stud bolt
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Thread Type: Full thread or double-end thread
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Standard: ASTM A193 Grade B8
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Matching Nuts: ASTM A194 Grade 8
Size Range
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Diameter: 1/4″ – 4″
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Length: As per ASME / customer specification
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Thread Standard: UNC / UNF / 8UN
Heat Treatment
ASTM A193 Grade B8 stud bolts are supplied in the solution annealed condition, ensuring maximum corrosion resistance and excellent ductility.
Testing & Inspection
ASTM A193 B8 stud bolts undergo strict quality control, including:
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Chemical analysis
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Tensile testing
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Hardness testing
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Dimensional inspection
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Visual inspection
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Certification: Mill Test Certificate (MTC) / EN 10204 3.1
Applications of ASTM A193 B8 Stud Bolts
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Chemical processing equipment
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Flanges and valves
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Heat exchangers
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Food, beverage, and pharmaceutical plants
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Marine and coastal installations
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Pressure vessels (moderate pressure)
| Grade | Size | Tensile ksi, min | Yield, ksi, min | Elong, %, min | RA % min | HBW | Rockwell |
|---|---|---|---|---|---|---|---|
| B8 Class 1 | All | 75 | 30 | 30 | 50 | 223 max | 96 max HRB |
| B8 Class 2 | Up to 3/4 | 125 | 100 | 12 | 35 | 321 max | 35 max HRC |
| 7/8 – 1 | 115 | 80 | 15 | 35 | |||
| 1-1/8 – 1-1/4 | 105 | 65 | 20 | 35 | |||
| 1-3/8 – 1-1/2 | 100 | 50 | 28 | 45 |
ASTM A193 Grade B8 specification covers requirements for 304/304L stainless steel bolting material with high tensile properties, for use in high temperature or high-pressure service and other special purpose applications.
ASTM A193 B8 Stud Bolt Chemical Properties
| Grade | C | Mn | Si | P | S | Ni | Cr | Mo |
| B8 (AISI 304) | 0.08% max | 2.00% max | 1.00% max | 0.045% | 0.030% | 8.0 – 11.0% | 18.0 – 20.0% | – |
Material: A193 B8 Stud Bolt and A194 8 Hex Nuts
A193 B8 Hex Bolt and A194 8 Hex Nuts
Standard: ASME B18.2.1, ASME B18.2.2.
Bolt -Grade Identification Markings
ASTM A193 B8 vs B8M Stud Bolts
| Item | B8 | B8M |
|---|---|---|
| Material | SS 304 | SS 316 |
| Corrosion Resistance | Good | Superior |
| Mo Content | No | Yes |
| Typical Use | General corrosion | Chloride environments |
ASTM A193 Grade B8 stud bolts offer excellent corrosion resistance, good mechanical strength, and reliable performance in corrosive and moderate-temperature applications. Fully compliant with ASTM A193, B8 stainless steel stud bolts are a trusted fastening solution for chemical, marine, and industrial piping systems.
ASTM A193 Grade B8 stud bolts made from austenitic stainless steel for corrosive and high-temperature applications.
HOW TO ORDER OUR ASTM A193 Grade B8 Stud bolt?
EXAMPLE#1,
Stud bolt full Thread, SS304, 7/8″ -9UNC x 90, ASTM A193 -Gr.B8,W/2 Heavy HEX NUT A194 Grade 8.
Quantity: 120 Each
